Scale matters. Once you achieve over a hundred of users, you got all the random bugs, and glitches appearing, and you can't guide everyone personally across UX issues. This is when lack of decent documentation, unpolished UI, and even the fact that it uses its own terminology (like "spaces") starts to hurt. I don't mean Synapse/Element combination is bad, but so far it's not great either.

Argue with the people in this thread that made this argument.